<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>component-4标签</title>
    <script type="text/javascript" src="../assets/js/vue.js"></script>
</head>
<body>
    <h1>component-4标签</h1>
    <hr>
    <div id="app">
        <component :is="who"></component>  
        <button @click="changeConponent">changeConponent</button> 
    </div>

    <script type="text/javascript">
        var componentA={
            template:`<div style="color:red">I'm componentA</div>`
        }
        var componentB={
            template:`<div style="color:green">I'm componentB</div>`
        }
        var componentC={
            template:`<div style="color:blue">I'm componentC</div>`
        }
        var app = new Vue({
            el:'#app',
            data:{
                who:'componentB'
            },
            components:{
                "componentA":componentA,
                "componentB":componentB,
                "componentC":componentC,
            },
            methods:{
                changeConponent:function(){
                    if(this.who=="componentA"){
                        this.who="componentB"
                    }else if(this.who=="componentB"){
                        this.who="componentC"
                    }else{
                        this.who="componentA"
                    }
                }
            }

        })
    </script>
</body>
</html>